My client has CS 5.1 for all the apps except for InDesign which is CS 5.5. They installed and re-installed our CS SDK extension which is built for PS, IL and ID. While they can see the extension and load it in PS and IL, they are unable to see the extension in ID at all under Window > Extensions. Is a mixed version of CS not supported for CS SDK extensions? is there any other way to troubleshoot this problem without having them to re-install CS?